These economy radiation protective glasses feature a sturdy and comfortable "Classic Safety Style." Each pair features a perforated brow guard, silicone nose guard and a rubberized temple bar for a secure fit with and a sleek and lightweight feel. Included dual lateral shields protect around the orbit of the eyes! The premium SF-6 Schott glass ensures enhanced distortion-free, radiation reduction with 0.75mm lead Pb equivalency and 0.5mm lateral protection.